gistfile1.js

$('.form').submit(function() {
  var valid = true;
  var errors = '';
	
	$(this).find('.required').each(function() {
		if ($(this).val() == '') {
			$(this).addClass('field-error');
			errors += 'The "' + $(this).attr('title') + '" field is required\n';
			if (valid) {
				$(this).focus();
			}
			valid = false;
		} else {
			$(this).removeClass('field-error');
		}
	});
	
	$(this).find('.email').each(function() {
		var pattern=/^([a-zA-Z0-9_.-])+@([a-zA-Z0-9_.-])+\.([a-zA-Z])+([a-zA-Z])+/;
		
		if (!pattern.test($(this).val())) {
			$(this).addClass('field-error');
			errors += 'The email address you entered is not valid\n';
			if (valid) {
				$(this).focus();
			}
			valid = false;
		} else {
			$(this).removeClass('field-error');
		}
	});
	
	if (!valid) {
		alert(errors + '\n ');
	}
	
	return valid;
});